Introduce the notion of an nterp frame.
See comments in nterp_helpers.cc. An nterp frame follows the
calling conventions and exception handling of the compiler. There are
no ManagedStack transitions, and the compiler and interpreter can
just call each other directly.
For the stack walker, an nterp frame looks like a compiled frame.
This CL introduces an nterp frame, another CL will contain an
implementation for x64.
Bug: 119800099
Test: test.py
Change-Id: Ie9b691f58908b7f283b4cd63b84b651526155d27
diff --git a/runtime/nterp_helpers.h b/runtime/nterp_helpers.h
new file mode 100644
index 0000000..758d1fd
--- /dev/null
+++ b/runtime/nterp_helpers.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_NTERP_HELPERS_H_
+#define ART_RUNTIME_NTERP_HELPERS_H_
+
+#include "quick/quick_method_frame_info.h"
+
+namespace art {
+
+class ArtMethod;
+
+/**
+ * Returns the QuickMethodFrameInfo of the given frame corresponding to the
+ * given method.
+ */
+QuickMethodFrameInfo NterpFrameInfo(ArtMethod** frame)
+ REQUIRES_SHARED(Locks::mutator_lock_);
+
+/**
+ * Returns the dex PC at which the given nterp frame is executing.
+ */
+uint32_t NterpGetDexPC(ArtMethod** frame)
+ REQUIRES_SHARED(Locks::mutator_lock_);
+
+/**
+ * Returns the reference array to be used by the GC to visit references in an
+ * nterp frame.
+ */
+uintptr_t NterpGetReferenceArray(ArtMethod** frame)
+ REQUIRES_SHARED(Locks::mutator_lock_);
+
+/**
+ * Returns the dex register array to be used by the GC to update references in
+ * an nterp frame.
+ */
+uintptr_t NterpGetRegistersArray(ArtMethod** frame)
+ REQUIRES_SHARED(Locks::mutator_lock_);
+
+/**
+ * Returns the nterp landing pad for catching an exception.
+ */
+uintptr_t NterpGetCatchHandler();
+
+/**
+ * Returns the value of dex register number `vreg` in the given frame.
+ */
+uint32_t NterpGetVReg(ArtMethod** frame, uint16_t vreg)
+ REQUIRES_SHARED(Locks::mutator_lock_);
+
+} // namespace art
+
+#endif // ART_RUNTIME_NTERP_HELPERS_H_